# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220070390011` · 02/02/2007 · Heidelberg Materials US Cement LLC
## Details
- **Degree of injury:** ACCIDENT ONLY
- **Classification:** IGNITION OR EXPLOSION OF GAS OR DUST
- **Accident type:** Accident type, without injuries
- **Occupation:** —
- **Activity:** —
- **Injury source:** —
- **Nature of injury:** —
- **Body part:** —
- **Days lost:** 0
- **Mine experience:** — years
## Operator
- **Controller:** Heidelberg Materials AG
- **Operator:** Heidelberg Materials US Cement LLC
- **Mine:** [1200063](https://api.morvs.ai/mine/1200063)
## Narrative

The #3 coal mill was slowly being brought back up to full production rate when an explosion occurred in the coal mill circuit causing the pressure relief explosion vent to rupture.  The shift supervisor had opened and then closed the tramp iron tipping valve to make sure it was operating correctly and appproximately 10 seconds later the explosion occurred.

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · MORVS · CC0 1.0*